umlaut validation

umlaut validation

This took me a while, but my problem is that people in Europe or Canada use "special characters" like normal characters:-)So if I want to validate a client side street name, it could easily be Hauptstraße (main street)

Validation does not accept it, because it insists, ß is no alphanumerical character. Does it mean I have to add äöüÄÖÜ ß each time in the "allowed" field? Or is there a way to include these "special characters" into the commonly accepted alphanumerical character set?Remember that the same applies to French, Spanish and others, meaning that l'avenue des Champs-Élysées would not be accepted as a street name, nor Frédéric Chopin as a name, or am I wrong?please help